The invention discloses a high-performance wallpaper base paper pulp and a process which uses the pulp to produce wallpaper base paper, the base paper pulp is formed by sizing agent and accessory, the sizing agent is formed by the combination of coniferous bleaching chemical wood pulp, latifoliate bleaching chemical wood pulp and coniferous bleaching chemical thermomechanical pulp; and the accessory is formed by the combination of intra-pulp starch, filling, intra-pulp sizing agent, surface sizing agent, wet strength agent and retention aid. By adopting the invention, bubble points generated by the wallpaper base paper in the PVC scratching and painting process can be greatly reduced, and the bonding strength between a PVC coating and the paper surface and the stability of the paper in wet deformation are improved, thus overcoming the shortcoming of the prior art, simultaneously, reducing the production cost and industrial pollution of the wallpaper base paper. The wallpaper base paper produced by the process has high dry and wet strength, good dimension stability, good loose depth, high opacity, and difficult yellowing. The used sizing agent is mainly high-yield APMP, forest resources are saved, pollution load is low, and the invention has better generalization significant to the current situation that the cost of domestic current paper making industry remains high, forest resources are lacked, and the pollution of paper making industry is severe.